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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 179 | $ 125 |  |
Allowance for loan losses, Collectively evaluated for impairment | 12,598 | 12,883 |  |
Allowance for loan losses, Total | 12,814 | 13,134 | $ 13,300 | $ 13,305
Outstanding loan balances, Individually evaluated for impairment | 3,728 | 3,460 |  |
Outstanding loan balances, Collectively evaluated for impairment | 1,149,831 | 1,160,986 |  |
Outstanding loan balances, Total | 1,153,758 | 1,164,661 |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration | 37 | 126 |  |
Loan balance of loans acquired with credit deterioration | 199 | 215 |  |
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 60 | 4 |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,299 | 1,476 |  |
Allowance for loan losses, Total | 1,359 | 1,562 | 1,569 | 2,018
Outstanding loan balances, Individually evaluated for impairment | 1,025 | 438 |  |
Outstanding loan balances, Collectively evaluated for impairment | 135,971 | 151,948 |  |
Outstanding loan balances, Total | 137,076 | 152,473 |  |
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration |  | 82 |  |
Loan balance of loans acquired with credit deterioration | 80 | 87 |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 8 | 6 |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,022 | 2,037 |  |
Allowance for loan losses, Total | 2,030 | 2,043 | 2,259 | 2,171
Outstanding loan balances, Individually evaluated for impairment | 532 | 1,010 |  |
Outstanding loan balances, Collectively evaluated for impairment | 162,453 | 163,089 |  |
Outstanding loan balances, Total | 162,985 | 164,099 |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 5,670 | 5,307 |  |
Allowance for loan losses, Total | 5,670 | 5,307 | 4,543 | 4,606
Outstanding loan balances, Individually evaluated for impairment | 43 | 44 |  |
Outstanding loan balances, Collectively evaluated for impairment | 436,117 | 425,579 |  |
Outstanding loan balances, Total | 436,160 | 425,623 |  |
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 105 | 109 |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,608 | 1,757 |  |
Allowance for loan losses, Total | 1,750 | 1,910 | 3,022 | 3,089
Outstanding loan balances, Individually evaluated for impairment | 1,335 | 1,360 |  |
Outstanding loan balances, Collectively evaluated for impairment | 265,976 | 267,247 |  |
Outstanding loan balances, Total | 267,430 | 268,735 |  |
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration | 37 | 44 |  |
Loan balance of loans acquired with credit deterioration | 119 | 128 |  |
Real Estate Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 820 | 834 |  |
Allowance for loan losses, Total | 820 | 834 | 413 | 420
Outstanding loan balances, Collectively evaluated for impairment | 95,856 | 97,531 |  |
Outstanding loan balances, Total | 95,856 | 97,531 |  |
Farm Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 6 | 6 |  |
Allowance for loan losses, Collectively evaluated for impairment | 405 | 424 |  |
Allowance for loan losses, Total | 411 | 430 | 407 | 442
Outstanding loan balances, Individually evaluated for impairment | 793 | 608 |  |
Outstanding loan balances, Collectively evaluated for impairment | 37,135 | 38,853 |  |
Outstanding loan balances, Total | 37,928 | 39,461 |  |
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 247 | 290 |  |
Allowance for loan losses, Total | 247 | 290 | 354 | 314
Outstanding loan balances, Collectively evaluated for impairment | 16,323 | 16,739 |  |
Outstanding loan balances, Total | 16,323 | 16,739 |  |
Unallocated [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 527 | 758 |  |
Allowance for loan losses, Total | $ 527 | $ 758 | $ 733 | $ 245

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